One of the reactors in Europe’s largest nuclear power plant in southern Ukraine suffered an accident that triggered an automatic shutdown this week. Reports suggest that damage occurred to a transformer in one of the 1000-megawatt reactors at the Zaporizhye plant, which provides over one-fifth of the country’s electricity.

Ukraine’s energy minister said that it was a “technical fault” and assured the public that there was “no threat” to the reactor’s safety, according to BBC News.

With the country already suffering fuel shortage, Ukraine this winter will probably be forced to import electricity from Russia.

Accidents at nuclear rectors makes folks understandably nervous, and is also a reminder that despite all the climate change benefits we get from nuclear energy – like cutting greenhouse gas emissions – there are a lot of risks associated with it, too.

Three Mile Island, Chernobyl and Fukushima all grabbed the world’s attention over the past 30 years when the crises unfolded at those plants. But what happened after they left the headlines?

The facility was only 3 months old when a cooling problem caused one of the reactors to overheat and release radioactive gases and iodine into the environment, but it wasn’t enough to cause any confirmed health effects to local residents.

The reactor was shut down permanently, was decontaminated and put into what is known as “post-defueled monitored storage,” with plans for dismantling only after its neighbouring reactor on site is shut down sometime in 2034.

In April 1986, the world’s worst nuclear disaster occurred at Ukraine’s Chernobyl power plant. technicians lost control of nuclear fission reactions in the reactor core and heat rose quickly until pressure built up and explored the core, releasing radioactive steam into the atmosphere. After the initial explosion occurred, fire broke out that sent large clouds of radioactive particles high into the air, which was then swept over a large part of Western Europe.

Thirty-one people – technicians and firefighters mostly – died from the accident itself, and untold thousands may have contracted cancer. Exact numbers are still being debated.

If you want to see the devastation that this nuclear accident wrought in its immediate surroundings check out newly-released video footage obtained via a remote-controlled drone. This is the first time that the nearby ghost town Pripyat has been filmed from the air.

The power plant itself is entombed within an aging concrete structure that was hastily built back during the old Soviet era.

Currently, an internationally-funded project is underway to build a massive 32,000 ton metal arch that will contain the entire building. Hopes are that it will be ready by 2017, before the existing shelter collapses and releases more radioactive-laden dust into the atmosphere like a dirt bomb. It is expected that the arch should last anywhere from 100 to 300 years.

Finally, the March 2011 Japanese earthquake and tsunami showed us that there can be natural forces that have to be considered with nuclear power. The Fukushima Daiichi power plant, located 220 km northeast of Tokyo on Japan’s east coast, had three of its six reactors melt down when it got hit by tsunami waves triggered by a 9.0 earthquake. This knocked out its generators which caused its reactors to overheat, explode and release radioactivity into the environment – contaminating food, water and air.

Over 300,000 people were evacuated from the surrounding villages. Nearly 16,000 residents are still unable to return to their homes because clean up efforts are being hindered by unsafe levels of radiation in the soil and water.

All this radiation from the disaster has definitely not been isolated to just Japan. Researchers monitoring the Pacific Ocean, in which much of the radiation spilled into, have detected radioactive isotopes this past November just 160 km off the coast of California.